package com.mergeades.chp04;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.TimeUnit;

public class WaitNotifyTest {
    static boolean flag = true;
    static Object lock = new Object();

    public static void main(String[] args) throws InterruptedException {
        Thread waitThread = new Thread(new Wait(), "waitThread");
        waitThread.start();

        TimeUnit.SECONDS.sleep(1);

        Thread notifyThread = new Thread(new Notify(), "notifyThread");
        notifyThread.start();

    }

    static class Wait implements Runnable {

        @Override
        public void run() {
            synchronized (lock) {
                while (flag) {
                    try {
                        System.out.println(Thread.currentThread() + " flag is true. Date:"
                                + new SimpleDateFormat("HH:mm:ss").format(new Date()));
                        lock.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                System.out.println(Thread.currentThread() + " flag is false. Date:"
                        + new SimpleDateFormat("HH:mm:ss").format(new Date()));
            }
        }
    }

    static class Notify implements Runnable{

        @Override
        public void run() {
            synchronized (lock){
                System.out.println(Thread.currentThread() + " flag is true. Date:"
                        + new SimpleDateFormat("HH:mm:ss").format(new Date()));
                lock.notifyAll();
                flag = false;
                sleep(5);
            }
            synchronized (lock){
                System.out.println(Thread.currentThread() + " flag is true. Date:"
                        + new SimpleDateFormat("HH:mm:ss").format(new Date()));
                sleep(5);
            }
        }
    }

    static void sleep(long time){
        try {
            Thread.sleep(time);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
